Is chalet a proper noun

No, "chalet" is not a proper noun; it is a common noun that refers to a type of wooden house or cottage, typically found in mountainous regions. Proper nouns are specific names for individuals, places, or organizations, such as "Chalet des Alpes," which would be a proper noun if referring to a specific chalet. In general usage, "chalet" describes a category of building rather than a unique entity.